Mario + Rabbids Kingdom Battle creative director Davide Soliani shared a little nugget about the game’s performance on Twitter. When Switch is docked, the game will run in 900p / 30fps. Like almost every other Switch game, it’s 720p / 30fps in portable mode.

30 fps sia portatile che docked. Ma docked è 900p.

— Davide Soliani (@DavideSoliani) August 4, 2017

Nice.Of course it would be best if it was 1080 docked, but 900p is great too!

Least its native when portable mode which is where I will be playing it mostly.

Just make the gameplay good, Ubi. And where the hell is Daisy!?

For graphics this pretty, 900p is a more than worthwhile tradeoff.

Not that it matters much in this game but why 30fps? Famous Ubi optimization or famous Nintendo potatoes?

Probably a Ubisoft decision.  It's entirely possible they just figured it being turn based meant it honestly didn't matter. 

Why bother pushing for 60fps in a turn based SRPG?

I'm pretty sure the first part of your post answers the second part.

Please let this be good and have DLC ready!